Abstract
In this paper we present a detailed study of a violent evolution of the 18 September 1995 eruptive prominence observed by the Hα telescope and the Multichannel Optical Flare Spectrograph in Ondřejov. The fast changes of the prominence structure started immediately after a weak radio burst at 3 GHz. This circumstance shows the presence of non-thermal processes. In the later phase of the prominence evolution a comparison of the Hα filtergrams with the Yohkoh Soft X-ray Telescope pictures was made. For a search of fine structures in the Hα images, an image processing technique was used. A detailed analysis of observations indicates magnetic field line reconnection, mainly in space below the rising Hα prominence. These reconnection processes are manifested not only by structural changes of the Hα prominence and X-ray loops but also by the character of Doppler velocities. Evidence of splitting and rotation was found in the Hα spectrum formed close to the reconnection space, and the typical velocities of such plasma movement were evaluated. We estimated amplitudes of rotational velocities, giving evidence about the rearrangement of helical structures during the process of the eruptive prominence activation. In the conclusion we discuss some implications of our results.
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Kotrč, P., Karlický, M., Šimberová, S. et al. Evidence of Magnetic Field Reconnection in the Hα Eruptive Prominence on 18 september 1995. Solar Physics 182, 393–409 (1998). https://doi.org/10.1023/A:1005096922501
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DOI: https://doi.org/10.1023/A:1005096922501